package com.lei.singleton;

/**
 * @author: leiGer
 * @Date: 2021/06/27
 * @Time: 22:35
 */

/**
 * 懒汉式
 * 带来了线程不安全问题
 */
public class Mgr03 {
    private static Mgr03 INSTANCE;
    private Mgr03(){}
    public static Mgr03 getInstance(){
        if(INSTANCE == null){
            try {
                Thread.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            INSTANCE = new Mgr03();
        }
        return INSTANCE;
    }

    public static void main(String[] args) {
        for (int i = 0; i < 100; i++) {
            new Thread(()->{
                System.out.println(Mgr03.getInstance().hashCode());
            }).start();
        }
    }

}
